TCH Technology products

I'm looking into products for occupancy detection on DCC-controlled layouts. I found an apparently attractive and economical line of
products from TCH Technology at http://www.tchtechnology.com/products . I was wondering if anyone had experience with any of these products.
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wrote:

Do a Google search for: model railroad TCH Technology Products reviews I found quite a lot about them. You can also with links you can save.
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